E4, E.IV or E-4 may refer to:

Entertainment

* E4 (TV channel), a digital television channel in the United Kingdom and Ireland * '' Every Extend Extra Extreme'', a video game from Q Entertainment *

Entertainment for All Entertainment for All Expo or E for All was a public video game trade show, created to allow the general public to see and experience new products from the video game industry. The inaugural E for All Expo was open October 18 to October 21, 2007, ...

, a video game expo

Transportation

Aero Asia International Aero Asia International (commonly known as AeroAsia) was the principle and one of the largest private international airline based in Karachi, Pakistan from 1993 until its collapse on 19 May 2007. Founded in 1993 by Tabani Group of Investors, A ...

, an airline, by IATA code

Roads

* European route E4, a road through Finland and Sweden *

E4 European long distance path The E4 European long distance path or E4 path is one of the European long-distance paths. Starting at Tarifa Andalusia, located at the southernmost end of the Iberian Peninsula, across the Strait of Gibraltar facing Morocco, it continues throug ...

, a European long-distance trail * Tōhoku Expressway, route E4 in Japan * E4 expressway (Pakistan) * South Kedah Expressway in Malaysia *

Subic Freeport Expressway The Subic Freeport Expressway (SFEX), formerly referred to as the Subic–Tipo Expressway and North Luzon Expressway Segment 7 (NLEX Segment 7), is a four-lane expressway that connects the Subic–Clark–Tarlac Expressway to the Subic Freeport ...

in the Philippines

Trains

E4 Series Shinkansen The was a high-speed shinkansen train type operated by East Japan Railway Company (JR East) in Japan. They were the second series of completely bi-level Shinkansen trainsets to be built in Japan (the other being the E1 series). They previousl ...

, a Japanese high-speed train *

CNW Class E-4 The Chicago and North Western Railway's Class E-4 comprised nine coal-burning streamlined 4-6-4 "Hudson" steam locomotives built in 1937 by Alco. They were built to haul the road's famous ''"400"'' express passenger trains, but before they were e ...

, a 4-6-4 steam locomotive of the Chicago & Northwestern Railway * EMC E4, a diesel locomotive *

LB&SCR E4 class The London, Brighton and South Coast Railway E4 class is a class of 0-6-2T side tank steam locomotive designed by Robert Billinton. They were introduced in 1897 and were essentially a larger version of the E3 Class. The cylinder diameter wa ...

, a steam locomotive of the London, Brighton & South Coast Railway * LNER E4 Class, a 2-4-0 steam locomotive built by the Great Eastern Railway and operated by the LNER

Military

* Boeing E-4, a U.S. military flying command post *

Fokker E.IV The Fokker E.IV was the final variant of the Fokker Eindecker, ''Eindecker'' fighter aircraft that was operated by Germany during World War I. Design and development Given the Fokker designation of M.15, the E.IV was essentially a lengthened F ...

, a 1915 German fighter aircraft * E4, the fourth enlisted rank in the Military of the United States, including: ** Petty officer third class in the United States Navy and United States Coast Guard ** Senior airman in the United States Air Force (

Sergeant Sergeant (abbreviated to Sgt. and capitalized when used as a named person's title) is a rank in many uniformed organizations, principally military and policing forces. The alternative spelling, ''serjeant'', is used in The Rifles and other uni ...

until 1976) ** Specialist (rank) in the United States Army (if the soldier is not a non-commissioned officer) ** Corporal in the United States Army and United States Marine Corps (if the soldier is a non-commissioned officer)

Science and technology

* E4-isoprostane, a type of isoprostane * Leukotriene E4, a naturally produced eicosanoid lipid mediator * E-4 process, an obsolete development process associated with photographic transparency film * Honda E4, a predecessor of Honda's ASIMO robot * RCS-4, a synthetic cannabinoid sold as "E-4" * E4 or E₄, an old name for the exceptional group F₄ *

Estetrol Estetrol (E4), or oestetrol, is one of the four natural estrogenic steroid hormones found in humans, along with estrone (E1), estradiol (E2), and estriol (E3), estetrol is a major estrogen in the body. In contrast to estrone and estradiol, estet ...

, an estrogen

Other uses

* E4, a postcode district in the E postcode area *

King's Pawn Game The King's Pawn Game is any chess opening starting with the move: :1. e4 It is the most popular opening move in chess, followed by the Queen's Pawn Game. Details about the move and the game plan White opens with the most popular of the twen ...

, or 1. e4, a chess opening move *

E4 grade In rock climbing, mountaineering, and other climbing disciplines, climbers give a grade to a climbing route or boulder problem, intended to describe concisely the difficulty and danger of climbing it. Different types of climbing (such as sport ...

, a grade of difficulty in rock climbing * E4 or E₄, musical notation indicating the E above

Middle C C or Do is the first note and semitone of the C major scale, the third note of the A minor scale (the relative minor of C major), and the fourth note (G, A, B, C) of the Guidonian hand, commonly pitched around 261.63 Hz. The actual frequen ...